package com.hmdp.utils;

import cn.hutool.core.lang.UUID;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;

import javax.annotation.Resource;
import java.util.Collections;
import java.util.concurrent.TimeUnit;

/**
 * @author 杨帆
 * @version 1.0
 */
public class SimpleRedisLock implements ILock{

    private String name;
    private StringRedisTemplate stringRedisTemplate;

    private static final String KEY_PREFIX = "lock：";
    private static final String ID_PREFIX = UUID.randomUUID().toString(true)+"-";

    private static final DefaultRedisScript<Long>UNLOCK_SCRIPT;
    static {
        UNLOCK_SCRIPT = new DefaultRedisScript<>();
        UNLOCK_SCRIPT.setLocation(new ClassPathResource("unlock.lua"));
        UNLOCK_SCRIPT.setResultType(Long.class);
    }


    public SimpleRedisLock(String name, StringRedisTemplate stringRedisTemplate) {
        this.name = name;
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean tryLock(long timeoutSec) {
        //获取线程标识(uuid+线程id)
        String threadId = ID_PREFIX+Thread.currentThread().getId();
        //获取锁
        Boolean success = stringRedisTemplate.opsForValue().setIfAbsent(KEY_PREFIX+name, threadId, timeoutSec, TimeUnit.SECONDS);
        return Boolean.TRUE.equals(success);
    }

    @Override
    public void unlock() {
        //调用lua脚本
        stringRedisTemplate.execute(UNLOCK_SCRIPT, Collections.singletonList(KEY_PREFIX+name),ID_PREFIX+Thread.currentThread().getId());
    }


//    @Override
//    public void unlock() {
//        //当前存入redis里面value的值
//        String threadId = ID_PREFIX+Thread.currentThread().getId();
//        //获取redis里面的value的值（线程标识）
//        String id = stringRedisTemplate.opsForValue().get(KEY_PREFIX + name);
//        if(threadId.equals(id)){
//            stringRedisTemplate.delete(KEY_PREFIX+name);
//        }


}
